(1) A browser plug-in that recognizes words and phrases on Web pages and automatically turns them into links to advertisers. Although users may find the tags annoying, website publishers loathe them because they make it easy for the user to move away from their sites. See TopText, banner ad, adserver and in-text advertising.
(2) (Smart Tags) A smart tags feature slated to be built into the Web browser in Windows XP, but removed in the first release of XP due to public opposition. Many considered Microsoft too large and powerful a company to implement such a feature.